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I am trying to generate an outbound ( client ) abap proxy in our WAS 640 based ERP system by pointing to a XI message interface on the XI integration repository. I have a single package ZPROXY ( not a main or a structure package ) created in our ERP system to hold the proxy structures ( classes, interfaces ). I have this package assigned to a transport layer ( a common transport layer through which other ABAP objects are to be transported ). Is it really necessary to have a four layer package structures for proxies to be transported and work in the QA/Production system ?